3-Substituted-2,4-dihydro-benzodiazepines

ABSTRACT

The 3-substituted-2,4-dihydrobenzodiazepines and their pharmaceutically acceptable acid addition salts are central nervous system depressants. A compound disclosed is 3-(N-(N&#39;&#39;-2thienoylpiperazino))-4,5-dihydro-1H-2,4-benzodiazepine hydroiodide.

'United States Patent [191 Schnettler et al.

[451 Sept. 16, 1975 3-SUBSTITUTED-2,4-DIHYDRO- BENZODIAZEPINES [75] Inventors: Richard A. Schnettler, Brown Deer;

John T. Suh, Mequon, both of Wis.

[73] Assignee: Colgate-Palmolive Company, New

York, NY.

22 Filed: Oct.2, 1974 21 Appl.No.:5ll,490

Related US. Application Data [63] Continuation-in-part of Ser. No. 317,799, Dec. 22,

1972, Pat. No. 3,867,388.

[52] US. Cl 260/268 BC; 424/250 [51] Int. Cl. C07D 295/12; CO7D 295/18 [58] Field of Search 260/268 BC Primary ExaminerRichard J. Gallagher Assistant ExaminerJose Tovar Attorney, Agent, or Firm-T. F. Kryshak; M. L. Youngs 6 Claims, No Drawings 3-SUBSTITUTED-2,4-DIHYDRO- PREPARATION OF THE COMPOUNDS BENZODIAZEPINES The compounds of the presetn invention are readily RELATED CASE prepared from 3-methylmercapto-4,5-dihydrolI-I2,4-

benzodiazepines of the formula This IS a continuation-ln-part of our earlier apphca- 5 tion Ser, No. 317,799, filed Dec. 22, 1972, now US. Pat. No. 3,867,388, issued Feb. I8, 1975.

DETAILED DESCRIPTION X The compounds of the present invention have the fol- 1O 3 lowing formula Y in which X and Y are selected from hydrogen, hydroxy, which are known compounds. E.-F. Elslager, et al., J. halogen, CF;,, alkyl of l to 4 carbon atoms or an alkoxy Her. Chem., 5, 609 (1968). of l to 4 carbon atoms, especially methoxy or ethoxy, Representative of the compounds that may be used and Z is as starting materials are the following:

0 3-methylmercapto-4,5-dihydlrolI-I-2,4- benzodiazepine, 3-methylmercapto-7,8-dimethoxy-4,5-dihydrol H- or 2,4benzodiazepine,

3-methylmercapto-7,8-dichloro-4,5-dihydrol H-2,4-

benzodiazepine, and BACKGROUND OF THE INVENTION 3-methylmercapto-6-fluoro-4,S-dihydro-lH-2,4-

benzodiazepine.

US. Pat. Nos. 3,496,179 and 3,609,152 disclose 2- The compounds of the invention are conveniently amino-3,4dihydroquinazolines which are antiprepared by dissolving the corresponding 3- hypertensive agents. An article by H. R. Rodriguez, et methylmercapto-4,5-dihydro-lH-2,4-benzodiazepine al., J. Org. Chem., 33, 670 1968), discloses the comhydroiodide and asuitable amine in anhydrous acetonipound 2-amino-4,5-dihydro-lH-2,4-benzodiazepine, trile and heating the mixture under reflux conditions and related compounds are disclosed in US. Pat. No. until the reaction is complete.

3,696,093. The described process may be illustrated as follows:

SCH 3 Y HI in which R, X and Y are as previously defined.

Among the compounds which may be prepared by the described process are the following:

3-[N- N -piperonoylpiperazino ]-4,5-dihydro- 1H- 2,4-benzodiazepine hydroiodide hydrate,

3-[ N-( N '-piperonoylpiperazino ]-7,8-dimethoxy- 4,5dihydro-1H-2,4-benzodiazepine hydroiodide hydrate,

3 N-( N -piperonoylpiperazino ]-7 8-dichloro-4 ,5-

dihydro-lH-2,4-benzodia.zepine hydroiodide hydrate,

3- N-( N '-piperonylpiperazino)]-4,5-dihydro-1H- 2,4-benzodiazepine hydroiodide,

3-[ N-( N '-piperonylpiperazino) ]-7,8-dimethoxy-4,5-

dihydro-lH-2,4-benzdiazepine hydroiodide, and

3-[N-(N'-piperonylpiperazino)]-7,8-dichloro-4,5- dihydro- 1 H-2,4-benz0diazepine hydroiodide.

The compounds in which X and/or Y are hydroxy may be readily prepared from the corresponding compounds in which X and Y are aralkoxy or alkoxy by conventional procedures.

Acid addition salts of the compounds of the present invention may be conveniently produced by contacting the free base with a suitable acid such as sulfuric acid, hydrochloric acid, suc'cinic acidQtartaric acid, benzoic acid or fumaric acid.

The thiocyanic acid addition salts of the compounds when condensed with formaldehyde form resinous materials useful as pickling agents according to U.S. Pat. Nos. 2,425,320 and 2,606,155. The compounds also form 'fluosilicic'acid addition salts which are useful as mothproofing agents according to US. Pat. Nos. 1,915,334 and 2,075,359. g The compounds of the invention are pharmacologically active. For example, the compounds 3-[N-(N'- piperonoylpiperazino)]-4,5-dihydro( lH)-2,4- benzodiazepine hydroiodide hydrate and 3-[N-(N'- piperonylpiperazino ]-4,5-dihydro( 1H)-2,4- benzodiazepine hydroiodide, when evaluated in mouse behavioral studies at intraperitoneal doses of 30 to 100 mg/kg, were fou'ndto produce a central nervous system depression characterized by sedation. The mouse behavioral studies also indicated that the compounds were relatively safe and possessed an LD in excess of 175 mg/kg of body weight. The behavioral studies were conducted essentially in accordance with the procedure outlined by S. lrwin in Animal and Clinical Pharmacologic Techniques in Drug Evaluation, J. H. Nodine and P. E. Siegler, Ed., Year Book Medical Publishers, Inc. (1964).

When intended for pharmaceutical use, the compounds are preferably combined with one or more suitable pharmaceutical diluents and additives and formed into unitdosage forms for oral or parenteral administration such as tablets, capsules and solutions.' The following examples are presented to illustrate this invention:

EXAMPLE 1 3- N-( N '-Piperonoylpiperazino)]-4,5-dihydro-1H-2,4- benzodiazepine hydroiodide hydrate A mixture of 9.4 g. (0.04 mole) of N-piperonoylpiperazine and 6.4 g. (0.02 mole.) of 3methylmercapto- 4,5-dihydro1H-2,4-benzodiazepin e hydroiodide in 150 ml. of dry acetonitrile. is refluxed 16 hours, cooled, the solids filtered and recrystallized from ethanol to afford 3-[N-(N-piperonoylpiperazino)]-4,5-dihydro- 1H-2,4-benzodiazepine hydroiodide hydrate as a white powder, m.p. l7918l.5.

Anal. Calcd. for C ,H, IN O C, 48.10; H, 4.81; N, 10.68. Found: C, 48.09; H, 4.53; N, 10.96.

EXAMPLE 2 3-[ N-( N -Carboethoxypiperazino)]-4,5-dihydro-1H- 2,4-benzodiazepine hydroiodide In ml. dry acetonitrile is suspended 8 g. (0.025 mole) 3-methylmercapto-4,S-dihydro-1l-l-2,4-

benzodiazepine hydroiodide and 7.9 g. (0.050 mole) ethyl N-piperazinocarboxylate. The mixture is refluxed 22 hours, cooled, and the solvent evaporated. The residue is triturated with isopropanol and the solid collected. Recrystallization from isopropanol gives 3-[N- (N'-carboethoxypiperazino) ]4,5-dihydrolH-2,4- benzodiazepine hydroiodide as a white solid, mp.

Anal. Calcd. for -benzodiazepine 16H ;,N O l: C, 44.66; H, 5.39; N, 13.02. Found; C, 44.51; H, 5.09; N, 12.80.

EXAMPLE 3 3-[N-(N -2-Thienylmethylpiperazino) ]-4,5-dihydro- 1H-2,4-benodiazepine hydroiodide A mixture of 5.4 g. (0.017 mole) of 3- methylmercapto-4,5-dihydro-1 H-2,4-benzodiazepine hydroiodide and 6.2 g. (0.034 mole) of N-2-thienylmethylpiperazine in 50 ml. of dry acetonitrile is refluxed for 23 hours. The solvent is evaporated and the residual oil dissolved in hot'isopropyl alcohol. The solids are filtered and dried to afford 3-[N-(N-2- thienylmethylpiperazino) ]4,5-dihydro- 1 H-2,4- benzodiazepine hydroiodide as a beige powder, m.p. 194-196.

Anal. Calcd. for 'C H lN S: C, 47.58; H, 5.10; N, 12.33. Found: C, 47.13; H, 5.05; N, 12.12.

. EXAMPLE 4 3-[N-( N -Piperonylpiperazino) ]-4,-5-dihydrol H-2,4- benzodiazepine hydroiodide A mixture of 7.5 g. (0.023 mole) of 3- methylmercapto-4,S-dihydro-1 H-2,4-benzodiazepine hydroiodide and 10.1 g. (0.046 mole) of N-piperonylpiperazine in 100 ml. of dry acetonitrile is refluxed for 20 hours. The solvent is evaporated and the residual oil triturated under hot isopropyl alcohol. The resulting solids are recrystallized twice from methyl alcohol to afford 3- N-( N -piperonylpiperazin0 ]-4,5-dihydr0- 1H-2,4-benzodiazepine hydroiodide as white crystals, 'm.p. 202204.

Anal. Calcd. for C H lN O C, 51.22; H, 5.12; N, 11.38. Found: C, 51.58; H, 5.16; N, 11.18.

We claim: 1. A compound selected from a compound of the formula and pharmaceutically acceptable salts thereof, in which X and Y are hydrogen, hydroxy, halogen, or CP lower alkoxy of l to 4 carbon atoms, and Z is 2. A compound of claim 1 in which X and Y are hydrogen or methoxy.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3 905, 980 DATED September 16, 1975 |NVENTOR(S) 1 Richard A. Schnettler and John T. Suh

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column t, line 2H, "for benzodiazepine 16H N O IN should read "for l6H N O' I:" Column 6, claim 5, line 2, "piperonylpiper'azino" should read "piperonoylpiper'azino".

Signed and Scalcd this [SEAL] A ttes t:

RUTH C. MASON C. MARSHALL DANN 1 Attesling Officer Commissioner of In: and Trademarks thirtieth Day of December 1975 

1. A COMPOUND SELECTED FROM A COMPOUND OF THE FORMULA
 2. A compound of claim 1 in which X and Y are hydrogen or methoxy.
 3. A compound of claim 1 in which X and Y are methoxy.
 4. A compound of claim 1 in which X and Y are hydrogen.
 5. The compound of claim 1 which is 3-(N-(N''-piperonylpiperazino))-4,5-dihydro-1H-2,4-benzodiazepine hydroiodide hydrate.
 6. The compound of claim 1 which is 3-(N-(N''-piperonylpiperazino))-4,5-dihydro-1H-2,4-benzodiazepine hydroiodide. 